Boss DD-5 won't turn on - New Switch installed, what else?

Hello smartie pantses. I got a non-working DD-5 in a trade and am trying to get it up and running again. I figured it was probably a switch, ordered one from Small Bear, put it in, and everything was working great - for about 1 day. Then the pin on the ground side of the switch worked its way out of the switch enclosure. Now I can't even get the thing to turn on when I manually contact the leads to the switch.

I get the light on when I plug it in initially, for about 3 seconds. After that, I can't get it to do anything. Took it out of the enclosure, tried using alligator clips to make the connection - thought maybe a wire was broken in the sheath - no dice.

Am I right that these switches are a simple momentary flip-flop? I was able to get it to turn on and off by simply touching the switch leads together when I was trying to see if it was the switch or something else.

What am I missing here?

Okay, so I read on the very sparsely populated Boss forum that the voltage regulator on these tends to go bad. It's a cheap and common part (78L05), so I got some and replaced it. Now I'm sure that I have 5 volts coming off the regulator. Apparently this messes with the switching. But it is still not working for me.

Anyone out there? 11 Gauge, you seem to have the serious pedal knowledge. Any tips?

Hello smartie pantses. I got a non-working DD-5 in a trade and am trying to get it up and running again. I figured it was probably a switch, ordered one from Small Bear, put it in, and everything was working great - for about 1 day. Then the pin on the ground side of the switch worked its way out of the switch enclosure. Now I can't even get the thing to turn on when I manually contact the leads to the switch.

I get the light on when I plug it in initially, for about 3 seconds. After that, I can't get it to do anything. Took it out of the enclosure, tried using alligator clips to make the connection - thought maybe a wire was broken in the sheath - no dice.

Am I right that these switches are a simple momentary flip-flop? I was able to get it to turn on and off by simply touching the switch leads together when I was trying to see if it was the switch or something else.

What am I missing here?

Sounds like your new switch went bad as well? But I'm not sure. If it works when you touch the leads together it is probably the switch though.

Am I right that these switches are a simple momentary flip-flop? I was able to get it to turn on and off by simply touching the switch leads together when I was trying to see if it was the switch or something else.

When you say flip-flop, is it one of those old 7400 series TTL parts? I have fried those things (in non-guitar circuits) before by poking around and accidentally putting 9 volts through them.

Not sure if this helps, or if it is even accurate, but this is supposedly the schematic for the DD-5.

http://music-electronics-forum.com/attachments/9484d1275707306-dd5.jpg

Actually it looks like the switch connects to some 32 pin IC. Not sure exactly what it is, but the pin names seem to indicate that they might be GPIO ports on a MCU...who knows how each pin is configured.

The Switch is a simple momentary pushbutton switch that connects to a circuit on the board that does the "Flip Flop" action. By your admission, you said the post worked it's way out of the switch so just replace the bad new switch.

Ok. I just fixed a crap load of boss pedals and this is how to trouble shoot it.

Make sure that you have a quarter inch plugged into both the input and output of the pedal while trouble shooting it. I like to use one small patch cable and just loop it around from input to output.

How are you powering the pedal? If it is not working while you have the pedal plugged in to an adapter, try powering it off of a 9 volt battery and vice versa.

Then completely eliminate the switch from the equation. Manually touch the two wires that would be going into the switch directly together. Is the light coming on? If it did come on the problem has to do with the switch. Make sure that the switch is super clean and make sure that when you reconnect it your solder joints are good.

This should be enough to get you started. Good luck dude.
How are you powering the pedal? If you are powering it off of and adapter try plugging

Bubbalou and Little Chubs have already said everything that needs to be said.Now it is up to you jondanger.
P.S. Little Chubs.It´s enough to put a plug in the input jack (and a battery in the box).Inserting the plug always connects the batterys minus to ground turning the pedal on.The footswitch will decide which way the signal should go.

Limbe,
Thanks man. Jondanger good luck.

Hello everybody. Thanks for the input.

I have tried plugging 1/4" plugs in both sides, connected a battery, and touched the two wires that go to the switch together manually. I'm getting the initial 3 second light, but the switch has no effect. I'm hoping I didn't fry the microprocessor or one of the little smd components.

Pretty sure at this point that it is NOT the switch. If anyone else has any advice, that would be great.

Thanks again everyone!